Optimizing the Charge Carrier and Light Management of Nonfullerene Acceptors for Efficient Organic Solar Cells with Small Nonradiative Energy Losses,Solar RRL

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Optimizing the Charge Carrier and Light Management of Nonfullerene Acceptors for Efficient Organic Solar Cells with Small Nonradiative Energy Losses
Solar RRL ( IF 6.0 ) Pub Date : 2021-01-22 , DOI: 10.1002/solr.202100008
Yanan Shi _{1,

2} , Junxiu Pan _{1,

3} , Jianwei Yu ₄ , Jianqi Zhang _{1,

2} , Feng Gao ₄ , Kun Lu _{1,

2} , Zhixiang Wei _{1,

2}

Affiliation

The photovoltaic properties and energy losses of organic solar cells (OSCs) based on nonfullerene acceptors (NFAs) are highly dependent on their molecular structures and aggregation morphologies. Charge carrier and light managements are important to optimize NFA molecules. Herein, four NFAs with different alkyl substituents and end groups, named BTP‐C11‐N2F, BTP‐C9‐N2F, BTP‐C9‐IC4F, and BTP‐C9‐N4F, are designed and synthesized by side‐chain shortening, end‐acceptor π‐extension, and fluorination. As a result, a favorable morphology is achieved in BTP‐C9‐N4F‐based OSCs by using typical high bandgap polymer PM6 as a donor, and this system obtains the highest power conversion efficiency of 17.0% with a short circuit current (J_sc) of 26.3 mA cm⁻², an open circuit current (V_oc) of 0.85 V, and a fill factor (FF) of 75.7%. In addition, its light (J_sc) and charge carrier (V_oc × FF) managements relative to the Shockley–Queisser limit are also increased. Extending the conjugation of the end groups increased the energy levels of NFAs and enabled an E_loss of 0.50 eV with a nonradiative recombination loss of as low as 0.20 eV in BTP‐C11‐N2F‐based OSCs. This work provides an efficient strategy to optimize the molecular structures of nonfullerene acceptors and further improve the properties of OSCs.

中文翻译：

优化具有小无辐射能量损失的高效有机太阳能电池的非富勒烯受体的电荷载流子和光管理

基于非富勒烯受体（NFA）的有机太阳能电池（OSC）的光伏特性和能量损耗高度依赖于其分子结构和聚集形态。电荷载流子和光管理对于优化NFA分子很重要。本文通过侧链缩短，端基设计和合成了四个具有不同烷基取代基和端基的NFA，分别命名为BTP-C11-N2F，BTP-C9-N2F，BTP-C9-IC4F和BTP-C9-N4F。受体π扩展，和氟化。结果，通过使用典型的高带隙聚合物PM6作为供体，在基于BTP-C9-N4F的OSC中获得了良好的形貌，并且该系统在短路电流（J _sc）的情况下获得了最高的17.0％的功率转换效率。的26.3 mA cm ^-2，开路电流（V _oc）为0.85 V，填充系数（FF）为75.7％。此外，相对于Shockley-Queisser极限，其光（J _sc）和电荷载流子（V _oc ×FF）管理也得到了提高。在基于BTP-C11-N2F的OSC中，扩展端基的共轭会增加NFA的能量水平，并使E_损失为0.50 eV，非辐射复合损失低至0.20 eV。这项工作提供了一种优化非富勒烯受体分子结构并进一步改善OSCs性能的有效策略。

更新日期：2021-01-22

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